Loud speaker resonator construction



May 30, 1933. w. H. GERNS LOUD SPEAKER RESONATOR CONSTRUCTION Filed March 22, 1932 In. rs-gl INVENTOR William E Eli-n5 Y fi /V M ATTORNEY Patented May 30, 1933 UNITED STATES,

WILLIAM H. GERNS, OF EAST ORANGE, J'LElESEY, ASSIGNORTO WIRED RADIO, INC.

OF NEW YORK, Y., A CORPORATION OF DELAWARE LOUD SPEAKER nnsonnron' oons'rnuc'rion Application filed March 22, 1932. ,Serial NOQGOOAOZ.

My invention pertains to a construction of resonator for use in radio loud speakers and the like.

One of the objects of my invention con sists in providing a simple and effective arrangement for the fabrication of the mov ng coil, the vibratile member, and supporting member employed in a loud speaker resonator.

A further object comprises providing means for an assembly construction for a loud speaker resonator construction adapted to quantity manufacturing methods.

I accomplish these and other desirable objects in a novel construction for a loud speaker resonator utilizing a unitary metallic clamp for joining a moving coil and a vibratile member in bond with a supporting member.

In the drawing which accompanies and forms a part of this specification and in which like reference numerals designate corresponding parts throughout:

Fig. 1 is a view of the construction of one embodiment of the loud speaker resonator of my invention; and

Fig. 2 is an enlarged sectional view of the assembly arrangement of the resonator of my invention.

Referring to the drawing in detail, there is provided a moving coil comprising a cylindrical coil form 1, composed of a suitable material such as paper, about which is provided a winding 2. The coil form 1 is secured to a ferrule 4 having an inwardly projecting flange and composed of a suitable material such as aluminum. The coil form 1 is secured to the ferrule 4 by cement or glue between the engaging areas. A flexible supporting member for the resonator, in the form of a spider 5, is positioned next to the inwardly projecting flange of the ferrule 4:. The vibratile element of the resonator, in the form of a cone 6, is provided at its narrow opening with an inward projection co-extensive with the flange of the ferrule 24 and positioned adjacent the spider 5.

In accordance with my invention, a grum-- met 7 composed of a suitable material such as aluminum, is provided for assembling the foregoing parts lnto a umtary structure.

7 The grummet 7 includes a flange 8 co-eXtensive with the inwardly projecting flange of the ferrule 4. The flange 8 has the outer edge thereof turned down in the form of a cylinder 9, the juncture of the cylinder 9 and "flange 8 being rounded to provide a suitable shoulder in engagement with the turned-in portion of the cone 6. The grummet 9 extends inside of the coil form 1 and is spun over to form an annular clamp 10, having a semi-circular cross-section, the edge of which is pressed against the inward projecting flange of ferrule 10 to form an intimate and rigid bond between the ferrule 10, the spider 5, and thecone 6.

The construction shown can be mounted, by means of the flexible spider 5 in a desired manner, so that the moving coil winding 2 operates under the influence of a suitable electromagnetic field for imparting vibrations to the cone 6 in accordance with suitable variations of the electromagnetic field under control of currents from a power amplifier or the like. 7

It will be obvious that my invention provides a simple and eflicient arrangement for the fabrication of a loud speaker resonator which is inexpensive in its construction, is adapted to quantity manufacture, and provides greater strength and ruggedness than other arrangements of resonator construction now known in the art. Although I have shown a preferred embodiment of my resonator construction it will of course be understood that modifications can be made therein without departing from the intended scope of my invention. I do not therefore desire to limit myself to the foregoing except insofar as may be pointed out in the appended claims.

What I claim as new and original and desire to secure by Letters Patent of the United States is:

1. In a resonator construction, a coil form secured to a ferrule having a flange integral therewith, a supporting member, a vibratile member, and a grummet, the inner portion of which is spun over into contact with the flange of said ferrule to form an annular clamp for securing said ferrule, said supporting member and said vibratile member in a rigid bond.

2. In a resonator construction, a coil form rigidly secured to a ferrule having an inwardly projecting flange, a flexible supporting member adjacent said flange, a vibratile member adjacent said supporting member but on the side opposite said ferrule, and a grummet the inner portion of which is spun over to form an annular clamp of semi-circular cross-section for engaging said ferrule, to bind said ferrule, said supporting member and said vibratile member in a rigid bond.

3. In a resonator construction, a coil form rigidly secured to a ferrule having an inwardly projecting flange, a flexible'spider, a Vibratile cone and a unitary clamp in the form of a grummet the inner portion of i which is spun over to form an annular bond of semi-circular cross section for securing said cone and sald ferrule rigidly to opposite sides of said spider. V

' VWLLIAM H.- GERNS. 

